Of course this raises the question why do you want to use an isosurface
to create a heightfield at all?
  The only thing I can think of is that you want to use non-linear
transformations on the heightfield. Creating a mesh instead of an isosurface
will lead to enormously faster render times, and you can move the vertex
points at will, which simulates non-linear transformations.
  I think there are macros in the official distribution for this (I don't
remember if they allow transformations, but if they don't, you can make
your own version of the macro with vertex transformations).

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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